Help me I’m new to my period!

So I got told that it will be a long wait between ur first and second but my second came less then a month after my first! Just when I’m about to go to the beach! But i don’t want to put in a tampon yet bc since it’s still new I don’t know if it will sudenlly be real heavy or light or just stop for some reason whil the tampon is up there! Please help is it normal to have ur 2nd one so soon and can I just swim with a pad?